<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>

    <style>
        .box {
           height: 100px;
            background-color: pink;
        }
        .box ul {
            background-color: orange;
        }
    </style>
</head>
<body>
    <div class="box">
        
    </div>
    <uL>
        <li>111</li>
        <li>222</li>
        <li>333</li>
        <li>444</li>
    </uL>
    <script>
        var box = document.querySelector('.box');
        var ul = document.querySelector('ul');
        box.addEventListener('click',function(event){
            console.log('box--------------');
            console.log(event.target);
            console.log(this);
        });

        ul.addEventListener('click',function(event){
            console.log('ul==============');
            console.log(event.target);
            console.log(this);
        });
    </script>
</body>
</html>